Drum-grinding machine



w. J. ANDRES March 14, 1933.

DRUM GRINDING MACHINE 1929 3 Sheets-Sheet 1 Filed March 18 munliwm IN VENT OR \Q/ LLLIAM-J. ANDRE5 ATTORNEY March 14, 1933. -w. J. ANDRES DRUM GRINDING MACHINE Filed March- 1s ,'*1929 :s Sheets-Sheet 2 v 1 IN V NTOR WILLIAM J. ANDRES ATTORNEY March 14, 193? w. J. ANDRES DRUM GRINDING MACHINE Filed March 18, 1929 3 sheets-sheet s 1 f /6 I I 24 if Z0 Z6 I m v v N NTOR F167 \gjLLIAM J, ANDRES ATTORNEY Patented Mar. 14, 1933 UNITED STATES PATENT OFFICE WILLIAM J. mans, or soon: BEND, INDIANA, assmnon, BY assmmnm's,

TO BEN'DIX DELAWARE AVIATION GOBPOBATION,-OE NEW YORK, N. Y., A. CORPORATION. OF

DRUM-GRINDING mcnmn Application flled liarch 18,11929. Serial 1T0. 348,097.

This invention relates to machines for grinding or otherwise, treating brake drums or the like, and is illustrated as embodied in a novel compactcand inexpensive machine for truing up brake drums by a grindingoperation without necessarily removing them from their wheels. An object of the invention is to provide means for traversing the work under power past theoperating tool without complicating the machine and.

ferably in such a manner as to leave the machine extremely compact so that it will not take up much floor or bench spacelin a garage or service station. I prefer to use individual motor drives on this machine,

and the illustrated embodiments show electric motors built into the machines.

These illustrated machines are arranged each with its motor mounted on a suitable base, the armature shaft having a high speed tool .at one'endand being connected at its other end by means such as novel reduction gearing to a low-speed shaft on which the wheel anddrum are mounted. Thus a single, motor drives the work slowly past a rapidly-driven tool. An important minor feature relates to a novel adjustable support such as an eccentric bearing for the lowspeed shaft, permitting relative bodily 'adjustment between the work and the tool.

The. above and other objects and features of the invention, including various novel and desirable details ofconstruction, will be apparent from the following description of the illustrative embodiments shown in the accompanying drawings, in which:

Figure 1 is a top plan view of a machine comprising an embodiment of the invention;

Figure 2 is a' side elevation of this machine,

Figure 3 is a section on the line 33 of speed shaft I Figure 5 is a partial section on the line 5-5 of Figure 1, showing one means for clamping the'adjustedeccentric bearings;

, Figure 6 is a top plan view of another machine comprising a .second embodiment of the invention;

Figure 7 is a section on the line 77 of Figure 6, showing the novel reduction gearing, and showing the motor, etc, in eleva tlon;

Figure 8 is a partial section on the line 88 of Figure 6, showing the means for. turning the eccentric shaftbearing in thismachine; and

Figure 9 is a partial section on the line 9-9 of Figure 6, showing the means for I clamping the eccentric hearing.

The machine of Figures 1-5 includes a suitable base 10, which may be mounted on a bench or a pedestal, and on which is mounted an electric motor 12 having an armature shaft 14 rotating, for example, at 4,000 B. P. M., and having at its front end a tool such as a grinding wheel 16 of emery or the like, The rear end of the armature shaft has a worm meshing with a worm gear 18 on one end of a transverse shaft 20 having. at its opposite end a worm driving a worm gear 22 on a low-speed shaft 24 rotating, for example, at 5 or 10 R. P. M. Gearing 18-22 forms reduction gearing connectilgig the rear ends of the two shafts 14 and suitable housing 26.

The front end of shaft 24 is adjacentthe tool 16, and forms a power-driven rotatable support engaging the hub of a wheel 28 having a brake drum 30 which is to be trued up by tool 16. A support such as aroller 32 on a swingin link 34 connected to the base 10, and urge toward tool- 16 by a spring" 36,

-may if desired, be arranged to engage the drum 30' or an equivalent piece of work shaft .24 slowly traverses the work past the rapidly revolvmggrindin wheel 16. I

In order toprovide or adjusting the work bodily toward and from the'tool 16,1

prefer to mount the shaft 24 eccentrically in a long'bearing member. 38 having at'its front end a cyI-lndrical portion 40 journaled in a post 42 rising from the base 10 and having at its rear end a cylindrical portion the gearing being arranged in a 90 opposite the tool 16. It will be seen that end portions (in which A 3o adjust shaft 24by means gear ing,

the shaft 24 is eccentrically journaled) being rigidly connected. by a U-shaped section strengthened by a longitudinal rib48 as best shown in dotted lines in Figure'4.

As appears in Figures 1 and 4, part 44 of bearing 38 is provided with a handle 50 by which t may be turned to make the desired adjustment, while as shown in Figures 1 and 5, the bearing may be clamped frictionally f to preserve the adjustment by a shoe 52 operated by a threaded stem 54 having an e1;- ternal operating handle 56.

The machine of Figures 6-9 differs from the one just described principally inbeing arranged to use a'conical grinding wheel 116, arranged at such an angle that its work-' engaging face is substantially parallel to shaft 24, thus inclining the head of the tool backwardly so that 'it will clear the heads of attaching bolts, etc., in the head of the brake drum 30. This puts the motor 12 ata slight angle, so that shafts 14 and 24, while generally parallel, are not exactly so as in the first embodiment, the reduction gearingpermitting this'arrangement without difli-culty. In this case, also, bearing 38 is turned to of a worm carried by post 42 and operated by an external hand wheel 62, and meshing with a worm cut injthe periphery of part 40 of the bearing. The clamping of the bearing is done by a nut 64 having an external operating handle 66 and threaded on a spindle 68. The tool 116 may be" dressed when necessary by a suitable tool 70, of any desired and usual type, threaded for 'len' thwi se adjustment in the'end of a slide 2 mounted on baselO and operable manually by a suitable handle 74. A stop. 76 determines. the idle position of the slide. .By. moving tool backand forth while the tool 116 isrotat- I the surface of the latter is trued up. The tool 70-moves substantially along the line at which the work 30 is tangent to the grinding wheel 116 when the latter is in use.

' The tool 16'- of the first machine may be truedin a similar manner by a tool (not shown) threadedinto the head 7 6 of a slide 7,8 operated by a handle '80, Y

It should be noted that hearing 38 is preferably so arranged-as to swing shaft 24 in an are directly toward and from the point of tangencyof-tool 16 or 116 andthe work, so thatthereis substantially no shifting of the work crosswise of the tooL- .While two illustrative embodiments have 0 been described in-detail, it is not my ntention to limit the scope of the invention to those particular embodiments, or otherwise than by the terms'of the appended claims. .'Iclaim: I I

1. A machine for truing brake drums or the like comprising, in combination, a motor gearin at the with an angularly ad ustable eccentric ,bearing for said second shaft operable to adjust the work bodily with respect to the tool.

2. A machine for'truing brake drums or the like comprising, in combination, a motor witha high-speed armature shaft hav-. ing a tool at one end, reduction gearing at the other end of the armature shaft, and a work support driven by said gearing and adapted to traverse the work-past said tool, together with a roller yieldingly engaging and support-ing the work opposite the tool.

3. A machine'for truing brake drums or the like comprising, in combination,'a motor with a high-speed armature shaft having a tool at one end, reduction gearing at the other end of the armature shaft, and a shaft generally paralleling the armature shaft and driven at one end by said gearing and having at its other end a work support adapted to traverse the work past said tool, to-

gether with an angularly adjustable eccenbearing for said second shaft operable tric 1 to adjust the work bodily with respect to I the tool; and one device for turning the bearing and another for clamping it in adjusted position.' Y

4. A machinecomprising, in combination, a base, a motor mounted on said base and having an armature shaft with -a tool at one end and a worm at its other end, atransverse shaft having at one end a worm ear dr ven by the armature shaft worm and avdriven shaft generallyparalleling the armature shaft and having at one end a worm gear driven by the driving worm and havgear -driven by 'the armature shaft worm .ing a driving'worm at its other end, and a Y and having a driving worm at its otherend,

and a driven shaft generally paralleling-the armature shaft and having 'at oneend worm gear driven by the driving worm an having, at its other end a work support -adjacent said tool, together with an adjustable:

eccentric bearing for. the driven shaft which can be turned to vary the relative positions of the work and the tool.

a motor having an armature shaft with-a 2 6. A" machine comp in combination" I transverse shaft having at -one end a worm gear driven by the armature shaft worm and having a. driving; worm at its other end,

and a driven sha generally paralleling the armature shaft an having at one end a worm gear driven by the driving worm and 5 having at its other end a work support adjaeent said tool.

7. A machine comprising, in ocmbmation,

a motor havin an armetnre shaft with a tool at one on and a worm at its other 3 end, a transverse shaft having at one end a worm gear driven by the armature shaft worm and having a drivin worm at its other end, and e driven s aft nerajly parallelin the armature shaftfan havmg 15 at one en a worm gear driven by the driving worm and having at its other end a work support adjacent Sitld 1.

machine comprising a hi 11 speed shaft, a rotatable tool at one en of the shaft, redhetion geeringnt the other end of the shaft, a second sha' genereiliydparalleling the first mentioned shaft an ri'ven at one end by the reduction gearing. work sup- Farting means termed at the ct er end of be second shaft, and an angularly ad'ustable eccentric bearin for the second s aft operable to adjust t e work bodily with respect tothe tool. I

9, A machine comprieing1 a bi h speed 30 shaft, a tool at one end of e she reduction gearing at'theother end of the shaft,

a second shaft driven by the reduction gearing and adapted to traverse the work past the tool, on angularl ad'ustable eccentric 95 bearin for the secon sha operable to edjustt e work bodily with respect to the tool and means for clamping the-eecond shaft in its adgusted posit o In testimony whereof, I have hereunto signed my name. v

t J. hNDRES. 

